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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <unistd.h>
     18 #include <dirent.h>
     19 #include <errno.h>
     20 #include <stdlib.h>
     21 #include <string.h>
     22 #include <sys/types.h>
     23 #include <sys/wait.h>
     24 #include <sys/stat.h>
     25 #include <signal.h>
     26 #include <fcntl.h>
     27 
     28 #include "ui.h"
     29 #include "cutils/properties.h"
     30 #include "install.h"
     31 #include "common.h"
     32 #include "adb_install.h"
     33 extern "C" {
     34 #include "minadbd/fuse_adb_provider.h"
     35 #include "fuse_sideload.h"
     36 }
     37 
     38 static RecoveryUI* ui = NULL;
     39 
     40 static void
     41 set_usb_driver(bool enabled) {
     42     int fd = open("/sys/class/android_usb/android0/enable", O_WRONLY);
     43     if (fd < 0) {
     44         ui->Print("failed to open driver control: %s\n", strerror(errno));
     45         return;
     46     }
     47     if (write(fd, enabled ? "1" : "0", 1) < 0) {
     48         ui->Print("failed to set driver control: %s\n", strerror(errno));
     49     }
     50     if (close(fd) < 0) {
     51         ui->Print("failed to close driver control: %s\n", strerror(errno));
     52     }
     53 }
     54 
     55 static void
     56 stop_adbd() {
     57     property_set("ctl.stop", "adbd");
     58     set_usb_driver(false);
     59 }
     60 
     61 
     62 static void
     63 maybe_restart_adbd() {
     64     char value[PROPERTY_VALUE_MAX+1];
     65     int len = property_get("ro.debuggable", value, NULL);
     66     if (len == 1 && value[0] == '1') {
     67         ui->Print("Restarting adbd...\n");
     68         set_usb_driver(true);
     69         property_set("ctl.start", "adbd");
     70     }
     71 }
     72 
     73 // How long (in seconds) we wait for the host to start sending us a
     74 // package, before timing out.
     75 #define ADB_INSTALL_TIMEOUT 300
     76 
     77 int
     78 apply_from_adb(RecoveryUI* ui_, int* wipe_cache, const char* install_file) {
     79     ui = ui_;
     80 
     81     stop_adbd();
     82     set_usb_driver(true);
     83 
     84     ui->Print("\n\nNow send the package you want to apply\n"
     85               "to the device with \"adb sideload <filename>\"...\n");
     86 
     87     pid_t child;
     88     if ((child = fork()) == 0) {
     89         execl("/sbin/recovery", "recovery", "--adbd", NULL);
     90         _exit(-1);
     91     }
     92 
     93     // FUSE_SIDELOAD_HOST_PATHNAME will start to exist once the host
     94     // connects and starts serving a package.  Poll for its
     95     // appearance.  (Note that inotify doesn't work with FUSE.)
     96     int result;
     97     int status;
     98     bool waited = false;
     99     struct stat st;
    100     for (int i = 0; i < ADB_INSTALL_TIMEOUT; ++i) {
    101         if (waitpid(child, &status, WNOHANG) != 0) {
    102             result = INSTALL_ERROR;
    103             waited = true;
    104             break;
    105         }
    106 
    107         if (stat(FUSE_SIDELOAD_HOST_PATHNAME, &st) != 0) {
    108             if (errno == ENOENT && i < ADB_INSTALL_TIMEOUT-1) {
    109                 sleep(1);
    110                 continue;
    111             } else {
    112                 ui->Print("\nTimed out waiting for package.\n\n", strerror(errno));
    113                 result = INSTALL_ERROR;
    114                 kill(child, SIGKILL);
    115                 break;
    116             }
    117         }
    118         result = install_package(FUSE_SIDELOAD_HOST_PATHNAME, wipe_cache, install_file, false);
    119         break;
    120     }
    121 
    122     if (!waited) {
    123         // Calling stat() on this magic filename signals the minadbd
    124         // subprocess to shut down.
    125         stat(FUSE_SIDELOAD_HOST_EXIT_PATHNAME, &st);
    126 
    127         // TODO(dougz): there should be a way to cancel waiting for a
    128         // package (by pushing some button combo on the device).  For now
    129         // you just have to 'adb sideload' a file that's not a valid
    130         // package, like "/dev/null".
    131         waitpid(child, &status, 0);
    132     }
    133 
    134     if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
    135         if (WEXITSTATUS(status) == 3) {
    136             ui->Print("\nYou need adb 1.0.32 or newer to sideload\nto this device.\n\n");
    137         } else if (!WIFSIGNALED(status)) {
    138             ui->Print("\n(adbd status %d)\n", WEXITSTATUS(status));
    139         }
    140     }
    141 
    142     set_usb_driver(false);
    143     maybe_restart_adbd();
    144 
    145     return result;
    146 }
    147